What the abjective lens is known as the high dry lens?

The objective lens referred to as the "high dry lens" is typically the 40x or 100x lens in a microscope, which allows for high magnification of specimens without the use of immersion oil. The term "dry" indicates that it operates without immersion oil, unlike the oil immersion lens, which is usually 100x. High dry lenses are useful for observing thin sections and mounted specimens, providing clarity and detail at higher magnifications.